CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Statement of Cash Flows [Abstract]
Net income (loss)	$ 652	$ 12,132	$ (8,462)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	24,179	27,334	32,542
(Recovery of) provision for doubtful accounts	(8)	80	(757)
Restructuring and other transition expenses, net of payments	6,608	0	0
Deferred income taxes	123	137	74
Impairment losses on goodwill and intangible assets	0	0	92
Net losses (gains) from sales of assets	394	(3,814)	(4,467)
ESOP and share-based compensation expense	5,691	4,692	3,563
Net (gains) losses on derivative instruments and investments	(950)	(4,276)	11,132
Change in operating assets and liabilities:
Restricted cash	(1,002)	8,084	(6,472)
Purchases of trading securities held for investment	(3,661)	(5,915)	(9,049)
Proceeds from sales of trading securities held for investment	2,358	4,290	7,633
Accounts and notes receivable	2,078	2,248	(2,429)
Inventories	20,470	(14,439)	5,115
Income tax receivable	(307)	181	353
Derivative (liabilities) assets, net	(7,269)	3,932	0
Prepaid expenses and other assets	(1,332)	(661)	(156)
Accounts payable	(16,841)	17,526	1,773
Accrued payroll expenses and other current liabilities	(4,606)	2,574	(8,785)
Accrued postretirement benefits	(1,507)	(1,905)	(6,451)
Other long-term liabilities	1,860	695	6,678
Net cash provided by operating activities	26,930	52,895	21,927
Cash flows from investing activities:
Payment to acquire business	(1,200)	0	0
Purchases of property, plant and equipment	(19,216)	(25,267)	(15,894)
Proceeds from sales of property, plant and equipment	273	4,536	5,666
Net cash used in investing activities	(20,143)	(20,731)	(10,228)
Cash flows from financing activities:
Proceeds from revolving credit facility	63,376	44,806	43,990
Repayments on revolving credit facility	(63,947)	(65,454)	(54,761)
Payments of capital lease obligations	(3,910)	(3,681)	(3,359)
Payment of financing costs	(571)	0	0
Proceeds from stock option exercises	1,548	1,480	1,203
Tax withholding payment related to net share settlement of equity awards	(116)	0	0
Net cash used in financing activities	(3,620)	(22,849)	(12,927)
Net increase (decrease) in cash and cash equivalents	3,167	9,315	(1,228)
Cash and cash equivalents at beginning of year	11,993	2,678	3,906
Cash and cash equivalents at end of year	15,160	11,993	2,678
Supplemental disclosure of cash flow information:
Cash paid for interest	769	1,258	1,783
Cash paid for income taxes	858	361	370
Supplemental disclosure of non-cash investing activities:
Equipment acquired under capital leases	55	1,217	626
Net change in derivative assets and liabilities included in other comprehensive income	(18,506)	17,524	(7,921)
Non-cash additions to equipment	$ 51	$ 142	$ 0